(x-y-z)*( )=x²-(y-z)²

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(x-y-z)*( )=x²-(y-z)²
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(x-y-z)*( )=x²-(y-z)²
(x-y-z)*( )=x²-(y-z)²

(x-y-z)*( )=x²-(y-z)²
是(x-y+z)*(x+y-z)=x²-(y-z)²